JP4518906B2 - 吸収性物品用の表面シート - Google Patents
吸収性物品用の表面シート Download PDFInfo
- Publication number
- JP4518906B2 JP4518906B2 JP2004305198A JP2004305198A JP4518906B2 JP 4518906 B2 JP4518906 B2 JP 4518906B2 JP 2004305198 A JP2004305198 A JP 2004305198A JP 2004305198 A JP2004305198 A JP 2004305198A JP 4518906 B2 JP4518906 B2 JP 4518906B2
- Authority
- JP
- Japan
- Prior art keywords
- nonwoven fabric
- heat
- fiber
- short fibers
- fibers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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Landscapes
- Health & Medical Sciences (AREA)
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- Biomedical Technology (AREA)
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- Laminated Bodies (AREA)
Description
また、特許文献1には、互いに平行な列を成す複数の膨らみ部を形成する液透過性の表面シートと、前記膨らみ部内で前記表面シートと吸収性コアとの間に介在する親水性素材層とから成る、吸収性物品の表面構造体が記載されている。
また、特許文献2には、2枚の不織布を部分的に熱融着させ、熱融着部以外で一方の不織布に不連続な凸部を形成した表面シートが記載されている。
また、特許文献1記載の表面構造体は、親水性素材層により膨らみ部にクッション性を付与することも目的としており、クッション性に富む膨らみ部が特定の方向に連続的に延びているため、面方向の柔軟性に劣るという問題もある。
また、特許文献1記載の表面シートは、凸部内が空洞であるため、液の引き込み性の点が課題がある。
図1には本発明の吸収性物品用の表面シートの要部拡大図が示されている。図1に示す表面シート10は、使い捨ておむつ、生理用ナプキン、パンティライナー(おりものシート)、失禁パッドなどの吸収性物品の肌当接面に用いられるものである。
より具体的には、凸部5及び熱融着部4は、X方向に、交互に且つ一列をなすように配置されており、そのような列が、Y方向に多列に形成されている。互いに隣接する列における凸部5及び熱融着部4は、それぞれ、X方向にずれて配置され、より具体的には、半ピッチずれて配置されている。
凸部部分に、このような繊維密度の勾配をつけることで、尿や経血等の排泄液を、凸部5表面から繊維集合体3にスムーズに移行させ、更にそれをスムーズに第2不織布2に移行させることができる。しかも、ー度に多量の液が表面シート10上に供給された場合においては、凸部5の存在により第1不織布の表面積が広くなっていることと、凸部5内の繊維集合体3に液を保持できることから、凸部に液を一時的に保持することができる。
表面シート10における熱融着部の面積率を計測する。計測には、画像解析ソフトNEWQUBE(NEXUS製、Ver.4.22)に画像を取り込みおこなう。画像の取り込みは、サンプルの中央部を使用し(目安として熱融着部が5〜20ヵ所画面内に入るようにする)、光源として[サンライトSL-230K2;LPL(株)社製]を2台使用し、CCDカメラ(HV-37;日立電子(株)社製)とレンズ(Nikon製 Ai AF Nikol 24mmF2.8D)をFマウントにより接続しおこなった。画像の処理は、「二値化」により熱融着部分を特定し、熱融着部の面積率を計測した。
不織布と短繊維層の重量を0.1mgオーダーまで計測し、熱融着部分を補正の上、第1又は第2不織布のうちの、熱融着部をもたない方の不織布と短繊維層の坪量を算出する。熱融着部をもつ方の不織布の坪量は、熱融着部をもたない方の不織布の熱融着部分相当の重量を除いた重量から、坪量を算出する。短繊維層においては、熱融着部に多数の繊維が延びていないことを確認する。
厚みは、表面シート10の切断面で最も厚みのある部位において、第1不織布、短繊維層、第2不織布各々の厚みを計測する。計測には、マイクロスコープVH‐8000(キーエンス製)を用い、50倍で観察した断面観察によって行う。断面は、フェザー剃刀(品番FAS‐10、フェザー安全剃刀(株)製)を用い切断して得る。この切断面に対して、液吸収前の熱融着部及び凸部部分の厚みの写った画像を記録し計測・算出する。
得られた坪量、厚みより、算出し密度を得る。
繊維密度ρ1及びρ3と各々の不織布における熱融着部近傍密度ρ1e, ρ3eと中間密度ρ1c, ρ3cが、ρ1e<ρ1c<ρ1、ρ3e≦ρ3c≦ρ3かつρ3e<ρ1eの関係を有すると、第1不織布での液残りを減少し、第2不織布へ(熱融着部近傍における)液の移動がおこりやすくなるため、表面シートのサラッと感が向上する。
さらに、熱融着近傍における短繊維層は、繊維が存在していないか、その密度ρ2eがρ3eより低いことが、第1不織布から第2不織布へ(熱融着部近傍における)液の移動を妨げない点から好ましい(繊維があまり存在しない状態)。第2不織布2においては、ρ3e≦ρ3c=ρ3であることが、短繊維層から液を移動しやすく、液戻りを防止する点から好ましい。なお、熱融着部近傍とは、表面シート10の断面における熱融着部から0.5〜1mm離れた位置であり、中間密度は、熱融着部近傍密度の計測位置と繊維密度の計測位置の長さの中間位置での密度である。
そのため、吸収性物品に用いた場合に、着用者の前後左右の何れの方向からも漏れが生じにくく、また、使用後の見た目も比較的きれいである。また、表面シートが面方向の柔軟性に優れ、X方向及びY方向のいずれにおいても柔軟に曲がるため、着用者とのフィット性が向上し、また、柔軟性が要求される物品や部位にも使用できる。
凸部部分の厚みH(図1参照)は0.5〜2.5mm、特に0.8〜1.7mmであることが好ましい。熱融着部4の厚みh(図1参照)は15〜300μm、特に20〜150μmであることが好ましい。表面シート10の単位面積(1cm2)当たりの凸部5の数は1〜20、特に6〜10個であることが好ましい。
X方向の底部寸法AとY方向の底部寸法Bとの比(底部寸法A:底部寸法B)は1:1〜1:10、特に1:2〜2:5であることが好ましい。凸部5の底部面積(底部寸法A×底部寸法B)は0.5〜50mm2、特に2〜20mm2であることが好ましい。
熱融着部4は、X方向の寸法C(図1参照)が0.1〜2mm、特に0.2〜1.0mmであることが好ましく、Y方向の寸法D(図1参照)が0.2〜5.0mm、特に0.5〜3.0mmであることが好ましい。
第1不織布としては、肌触りの観点から、カード法等により得た繊維ウエブにエアスルー法で繊維同士の熱融着点を形成したエアースルー不織布や、ヒートエンボス不織布、エアレイド不織布、ニードルパンチ不織布等が特に好ましく用いられる。第2不織布としては繊維密度を高め第1不織布や短繊維層から液を移動し易くする観点から、カード法等により得た繊維ウエブにヒートロール法で繊維同士の熱融着点を形成したヒートロール不織布やヒートエンボス不織布、スパンボンド不織布、メルトブロー不織布、スパンレース不織布等が特に好ましく用いられる。
(1)第1及び第2不織布それぞれの構成繊維よりも熱融着性に劣る繊維(以下、非熱融着性繊維ともいう)。
非熱融着性繊維を用いることにより、使用時の圧力変化に繊維の動きが自由に対応し、表面シート10のクッション感を高める。
非熱着性繊維は、その太さが0.5〜6.6dtex、特に1.1〜3.3dtexであることが好ましく、坪量が5〜50g/m2、特に10〜30g/m2であることが好ましい。
潜在捲縮性繊維を用いることにより、表面シート10の製造段階又は表面シート10を用いて吸収性物品を製造する段階における熱処理により、凸部5に所望の性状を付与することができる。例えば、捲縮の程度を高くして圧縮に対する弾性回復力に優れた凸部を形成したり、毛管径の小さな繊維構造体とすることで、液引き込み性に優れた短繊維・第2不織布を形成することができる。
例えば、吸収性物品用のシートとして、表面シートと吸収体の間に配置されるシート、立体ギャザー(防漏壁)形成用のシート(特にギャザーの内壁を形成するシート)等に用いることができ、また、吸収性物品以外の用途として、清掃シート、特に液吸収を主とする清掃シートや、対人用の化粧シート等として用いることができる。清掃シートに用いる場合、凸部において、平滑でない被清掃面への追従性が良好であるため、第1不織布側を被清掃面に向けて使用することが好ましい。化粧シートとして用いる場合、凸部において対象者の肌に追従し、またマッサージ効果を発現するとともに、余分な化粧剤(別途使用)や汗の吸収を行うことができるため、第1不織布側を肌側に向けて使用することが好ましい。
更に、凸部に充填した繊維シートを薬剤の種類によって選別し各種薬剤を予めもしくは使用前に吸収させておくことで、徐々に薬剤を放出し、薬剤に応じた効果を発現することができる。例えば、清掃シートであればワックスなどの保護材、化粧シート等であれば化粧剤や保湿剤を徐々に放出可能である。
1 第1不織布
2 第2不織布
3 短繊維からなる繊維集合体
4 熱融着部
5 凸部
Claims (4)
- 吸収性物品の肌当接面に用いられる表面シートであって、
互いに積層された第1不織布及び第2不織布が部分的に熱融着されて熱融着部が形成されており、
第1不織布は、前記熱融着部以外の部分が、着用者の肌側に向けて突出した凸部を形成しており、該凸部は、表面シートの面方向の一方向及び該一方向に直交する方向の両方向に不連続に多数形成されており、
前記各凸部の内部には、短繊維が充填され、前記熱融着部には、前記短繊維が実質的に存在しておらず、
表面シートの凸部部分における繊維密度が、第1不織布、前記短繊維、第2不織布の順に高くなっている、吸収性物品用の表面シート。 - 前記短繊維は、第1及び第2不織布それぞれの構成繊維よりも熱融着性に劣る繊維である請求項1記載の吸収性物品用の表面シート。
- 前記短繊維は、螺旋状の捲縮を発現した潜在捲縮性繊維である請求項1又は2記載の吸収性物品用の表面シート。
- 互いに積層された第1不織布及び第2不織布が部分的に熱融着されて熱融着部が形成されている積層不織布であって、
第1不織布は、前記熱融着部以外の部分が突出して凸部を形成しており、該凸部は、積層不織布の面方向の一方向及び該一方向に直交する方向の両方向に不連続に多数形成されており、
前記各凸部の内部には、短繊維が充填され、前記熱融着部には、前記短繊維が実質的に存在しておらず、
積層不織布の凸部部分における繊維密度が、第1不織布、前記短繊維、第2不織布の順に高くなっている積層不織布。
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JP2004305198A JP4518906B2 (ja) | 2004-10-20 | 2004-10-20 | 吸収性物品用の表面シート |
CN2005800336577A CN101035493B (zh) | 2004-10-20 | 2005-10-12 | 吸收性物品用的正面片材 |
PCT/JP2005/018779 WO2006043453A1 (ja) | 2004-10-20 | 2005-10-12 | 吸収性物品用の表面シート |
EP05793210A EP1803429B1 (en) | 2004-10-20 | 2005-10-12 | Topsheet for absorbent articles |
KR1020077009875A KR20070069185A (ko) | 2004-10-20 | 2005-10-12 | 흡수성 물품용의 표면시트 |
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USH1511H (en) * | 1992-09-10 | 1995-12-05 | Chappell; Charles W. | Absorbent articles having improved longitudinal fluid movement |
JP3215262B2 (ja) * | 1994-06-03 | 2001-10-02 | ユニ・チャーム株式会社 | 使い捨ての体液吸収性物品 |
SE518130C2 (sv) * | 1998-10-05 | 2002-08-27 | Sca Hygiene Prod Ab | Absorberande alster med termoplastiska fibrer i vätske överföringsskiktet |
JP3875009B2 (ja) * | 2000-09-01 | 2007-01-31 | ユニ・チャーム株式会社 | 連続フィラメントの表面材を用いた吸収性物品 |
JP3609361B2 (ja) * | 2000-10-12 | 2005-01-12 | 花王株式会社 | 立体シート材料 |
JP3611838B2 (ja) * | 2001-12-28 | 2005-01-19 | 花王株式会社 | 吸収性物品用の表面シート |
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US6827764B2 (en) * | 2002-07-25 | 2004-12-07 | 3M Innovative Properties Company | Molded filter element that contains thermally bonded staple fibers and electrically-charged microfibers |
EP1504739B1 (en) * | 2003-08-07 | 2013-01-30 | The Procter & Gamble Company | Latex bonded acquisition layer for absorbent articles |
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2004
- 2004-10-20 JP JP2004305198A patent/JP4518906B2/ja not_active Expired - Fee Related
-
2005
- 2005-10-12 KR KR1020077009875A patent/KR20070069185A/ko not_active Application Discontinuation
- 2005-10-12 WO PCT/JP2005/018779 patent/WO2006043453A1/ja active Application Filing
- 2005-10-12 US US11/664,270 patent/US20080108962A1/en not_active Abandoned
- 2005-10-12 CN CN2005800336577A patent/CN101035493B/zh not_active Expired - Fee Related
- 2005-10-12 EP EP05793210A patent/EP1803429B1/en not_active Not-in-force
Patent Citations (2)
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JPH03267058A (ja) * | 1990-03-16 | 1991-11-27 | Zuikou:Kk | 吸収体表面シートおよび吸収体製品 |
JP2003275239A (ja) * | 2002-03-22 | 2003-09-30 | Kao Corp | 吸収性物品 |
Also Published As
Publication number | Publication date |
---|---|
CN101035493B (zh) | 2012-02-08 |
CN101035493A (zh) | 2007-09-12 |
JP2006115974A (ja) | 2006-05-11 |
EP1803429A1 (en) | 2007-07-04 |
KR20070069185A (ko) | 2007-07-02 |
EP1803429A4 (en) | 2009-12-23 |
EP1803429B1 (en) | 2011-12-14 |
WO2006043453A1 (ja) | 2006-04-27 |
US20080108962A1 (en) | 2008-05-08 |
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